Unitek Miyachi LW250 Operation, Maintenance And Service Manual page 89

Code Indication on
No. Control Panel Screen
14 - Branch Shutter Trouble for
17 Nos. 1 through 4
18 No Light
19 Over Limit of Laser Power
20 Under Limit of Laser Power
23 Phase Trouble
24 Memory Trouble
25 Set Error Over Limit of Max
Power
27 Pump Overheating
28-29 Bank A/B Alarm
30 No Current
31 IGBR Trouble
990-605 REV B: May, 1997
High
Voltage
OFF
–
–
–
OFF
–
–
OFF
OFF
OFF
OFF
LW250 PULSED Nd: YAG LASER
CHAPTER 8: SERVICE
Abnormal
Output
ON A laser Start signal has been input
while the branch shutter or time
branch unit is moving.
– The laser output is below 0.3 J.
– Reconfirm the upper limit of the set
value. Change the upper limit.
– Verify the lower limit setting or the
flash lamp. Change the setting or
replace the flash lamp.
ON Check the three-phase input power
wiring.
ON Memory backup lithium battery
charge is low. Replace the battery.
ON The input power setting is beyond
the maximum capacity (voltage,
pulse width, repetition rate). The
setting will be restored to the values
before the change.
ON Cooler pump is overloaded. Check
Deionized water path for blockage.
ON Frequent condition change activates
the thermostat inside the capacitor
bank. Increase the interval of the
condition changes. The cooling fan
motor's air filter is clogged in the rear
of the laser. This caused the
overheating of the power supply.
Clean the filter.
ON Laser is turned on but no current is
flowing in the flash lamp. Replace
the defective lamp.
ON Current is flowing to the flash lamp,
but the laser is turned off. Probable
defective power supply. Contact
Unitek Miyachi.
Remedy
8-16